/*
 * *** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/dcm4che.
 *
 * The Initial Developer of the Original Code is
 * J4Care.
 * Portions created by the Initial Developer are Copyright (C) 2015
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * See @authors listed below
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * *** END LICENSE BLOCK *****
 */

package org.dcm4chee.arc.code.impl;

import org.dcm4che3.data.Code;
import org.dcm4che3.util.StringUtils;
import org.dcm4chee.arc.entity.CodeEntity;

import javax.ejb.Stateless;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;

/**
 * @author Gunter Zeilinger <gunterze@gmail.com>
 * @author Vrinda Nayak <vrinda.nayak@j4care.com>
 * @since Jul 2015
 */
@Stateless
@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
public class CodeServiceEJB {

    @PersistenceContext(unitName="dcm4chee-arc")
    private EntityManager em;

    public CodeEntity findOrCreate(Code code) {
        try {
            return find(code);
        } catch (NoResultException e) {
            CodeEntity entity = new CodeEntity(code);
            em.persist(entity);
            em.flush();
            return entity;
        }
    }

    private CodeEntity find(Code code) {
        TypedQuery<CodeEntity> query = em.createNamedQuery(
                CodeEntity.FIND_BY_CODE_VALUE_WITH_SCHEME_VERSION,
                CodeEntity.class)
                .setParameter(1, code.getCodeValue())
                .setParameter(2, code.getCodingSchemeDesignator())
                .setParameter(3, StringUtils.maskNull(code.getCodingSchemeVersion(), "*"));
        return query.getSingleResult();
    }
}
